# Questions tagged [magnetic-variation]

Questions about the difference between magnetic north and true north, which various based on geographic location

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### What does the expression (For VOR/ILS/MLS, give VAR) in the table mean? Because VAR (magnetic variation) value is not given in the table

What does the expression (For VOR/ILS/MLS, give VAR) in the table mean? Because the VAR (magnetic variation) value is not given in the table. The table image was taken from the AIP Turkey document for ...
• 2,049
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### Are the runway directions given in the table relative to magnetic north or true north? (True or Magnetic?)

Are the runway directions given in the table relative to magnetic north or true north? (True or Magnetic?) How can I understand this? Is there a specific case for charts?
• 2,049
1 vote
88 views

### Why is the magnetic variation value from 1999, although the AIP Charts in my country are up to date?

Why is the magnetic variation value from 1999, although the AIP Charts in my country are up to date? In all of the chart examples I shared below, the variation value is 3.2°E and belongs to 1999. ...
• 2,049
838 views

### Why does Garmin Pilot tell me a wrong magnetic variation?

For example. In KCNO, the mag variation on sectional chart is 11.5E. But on some websites and in Garmin pilot, it says it's 14E. Why would this happen?
• 331
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### Which of the arrows in the magnetic variation symbol represents which North value (Magnetic N, True N)?

Which of the arrows in the magnetic variation symbol represents which North value (Magnetic N, True N)? According to my calculations, the arrow pointing to the top should point to magnetic north, ...
• 2,049
163 views

### Which "North degree" is using on the PFD heading, Jeppesen Charts and Maps? (Headind indicator, MSA, coordinate lines, bearings..) True or Magnetic?

I found out that "All charts are drawn in reference to true north". But if my heading indicator shows a magnetic heading on my flight display, how do I apply the true heading value on the ...
• 2,049
914 views

### Why is the treatment of magnetic variation different for NDB and VOR?

Why in solving numerals of NDB and VOR, do we apply variation at the station in case of VOR and at the aircraft in case of NDB?
• 913
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### Do large cities contain enough iron to significantly affect an aircraft's magnetic compass?

In most areas of the world, the magnetic compass is the ultimate heading reference. Although pilots look to the directional gyro most of the time when flying (because the directional gyro's reading ...
• 28k
877 views

### Does SkyVector's flight plan give wrong magnetic variation corrections?

Lately I have noticed that Skyvector's Flight Planning tool "Nav Log" has been showing very wrong magnetic variation corrections for particular legs of my flight plans. The corrections ...
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### Why does the 0 radial on a sectional's VOR appear not to point to magnetic north? [duplicate]

I have been scanning sectional charts and have noticed that the local magnetic declination is always a few degrees off from the 0 radial of VOR's around it. I have been told that the two are supposed ...
• 113
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### How can I determine the runway number from its true bearing and magnetic variation? [duplicate]

Given: Runway True Bearing 007° Magnetic Variation 4°E What is the runway number (or designator)?
• 55
535 views

### How can I use a magnetic declination chart to calculate true track, magnetic track and magnetic variation?

If I am given values such as 30 degrees south and 75 degrees east with a true track value such as 70 degrees, how would I calculate the magnetic track? I understand that True track = Magnetic + ...
266 views

### What official government document should a pilot check to determine what magnetic north a VOR was set to when it was commissioned?

Today I learned that VOR stations are all set to magnetic north at the time of commission, and since magnetic north moves, the VOR is not necessarily in-line with magnetic north in the present. Where ...
• 8,751
827 views

### Why do both east and west isogonic lines tilt toward the west as they go north?

Here is a picture of the 3 degree east isogonic line just north of Tulsa, OK. Here is a picture of the 4 degree west isogonic line just east of Nashville, TN. They both trend westward in relation to ...
• 8,751
1 vote
202 views

### Is airport's magnetic variation value used for terminal procedure design?

I am studying how instrument flight procedures are coded to ARINC-424 format, and since I was curious about the method used to determine the outbound/inbound magnetic courses, I checked the section ...
• 1,853
598 views

This question is from the PPL questions book, navigation part. Given: QDM: 279° VAR: 5° W DEV: 5° E The QDR equals...
• 311
1 vote
845 views

### Does the movement of the magnetic poles affect aviation?

Recently I read that Earth's magnetic pole moves quite significantly, several kilometers. Do these changes affect aviation, i.e. for pilots landing their airplanes?
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### Is my understanding of magnetic variation and declination (for a VOR) correct?

AIXM (the XML-based exchange model for AIP by Eurocontrol and european AIS) defines the following properties for a VOR: codeTypeNorthA code indicating the ...
• 484
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### Is this the correct sequence of steps to convert from true course to compass heading?

I wanted to confirm my understanding of VFR Flight Planning/Dead Reckoning with relation to heading and course calculation. Is the below correct? Using a plotter, draw a line from departure airport ...
• 163
1 vote
3k views

### Do I use true or magnetic north in headwind component calculations? [duplicate]

For the landing performance calculations, I want to calculate the headwind component. I can do this with the runway heading and the reported wind direction and speed. But do I need to make any ...
• 263
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### Are artificial magnetic fields used or proposed to be used to shield high altitude pilots and astronauts from charged, high energy radiation?

If not for the earth's magnetic field our atmosphere would be bombarded by high energy plasma (ionized gas) from the sun and other space sources. At very high altitudes and orbital altitudes this ...
• 1,369
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### How often, and how promptly, do airports have to renumber runways because of magnetic pole drift? [duplicate]

This question was prompted by this answer to another question by Jamiec. As the magnetic poles drift (usually pretty unpredictably), runway numbers become inaccurate. As noted in the linked answer, ...
• 975
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### Why does this chart seem to show airports with magnetic variation up to 90 degrees?

I am trying to understand some plots of the earth's magnetic variation (declination) by trying to correlate what I see in a figure like the one below with the variation reported for some airports. I'm ...
• 173
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### What course should be taken to make estimated calculations?

(skyvector.com) When I want to calculate the leg time from GIJ to CRL going along the airway J554, at say FL190, I know that I have to calculate the ground speed first, but in order to do that, ...
4k views

### Why do METARs report wind relative to true north rather than magnetic?

Why isn't the wind in a METAR given in magnetic heading, to match the runway numbers? Especially for areas where there is a double-digit magnetic declination. Secondary/optional question: does the ...
3k views

### Where do I land if I fly from KLAX with a constant east heading, crossing the US and the Atlantic ocean?

Los Angeles KLAX and Casablanca GMMN (Morocco) are at the same latitude. If the aircraft follows a magnetic 090° heading, the initial true heading will be 102° due to the declination. (source ...
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### How do airports determine when they should change their runway numbers?

Runway numbers in most of the world are based on the runway's orientation relative to magnetic north. For example a runway with a magnetic heading of 135° to 144° will be numbered ...
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39k views

### How do I convert true heading to magnetic heading or the other way around?

Is there a method by which the conversions can be achieved on the fly by using a mathematical formulae and not using specific area charts?
142k views

### What's the difference between True vs Magnetic headings?

What is the difference between a true and a magnetic heading? Why are/were magnetic headings used in aviation?
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